My exp with cocci was I saw the blood in the poop, didn't know who did it. Had sulmet in the house began dosing that day. 2 days later while still treating I saw a couple of blood poops. Kept up the sulmet for the full 5 days. Gave yogurt/oatmeal as treat. Added dried milk into feed, someone said it coats the intestines, helpful? don't know but am a worrier.
Bought Dolomite (sp) Lime at feed store, spread it around the run with a rake - supposed to cut down on cocci in soil, can't get rid of them but can stop a bloom. Changed out the coop shavings and put new in with DE and stall dry to make sure it was super dry, no cocci blooms in there.
And everyone lived. So keep it up it can't hurt and you may have the great outcome.
Good luck.
Trixie